Consuming Sinkhole

You move your hands to control the earth, opening a hole through reality. A 30ft cylinder centered on the floor opens up into a large black hole that actually leads into a pocket dimension. Any creature standing in the 30ft cylinder falls into the pocket dimension. Any creature within a 45ft radius of the center of the cylinder must make a DC 18 Strength saving throw or be pulled into the hole. When a creature falls into or is pulled into the hole, they take 25 (5d10) force damage. While inside the pocket dimension, the creature feels like it is constantly falling. Once the caster ends its concentration or once the duration ends, the creatures inside the hole are thrown out of it, and the hole closes underneath them. The creatures are not thrown high enough to take damage from the fall.